I have a map service I am testing on internally with some popups on a dynamic map service layer. They work perfectly in Firefox (version 45.0.1), but not in Chrome (version 50.0.2661.102) or Internet Explorer (version 11.0.96 on my computer). I am using the ArcGIS JS API 3.16.

juturna, can you share the Map Service URL or is it private? Can you share the code of the web application you're using the view the map service? Or are you viewing it through the "View In: ArcGIS JavaScript" link in your ArcGIS Server REST Page?
– GavinRJun 11 '16 at 20:36

1 Answer
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When modern browsers behave dramatically differently it is usually worth validating your HTML using an online validator such as https://validator.w3.org/ since how they handle invalid html varies much more than how they handle valid html. In particular look for unclosed tags in the popups. If you can't get this to work I suggest posting the content of one of your popups.